s = f.load(filename);and when I want to change the obj file ,first i use the "objTrans.removeChild(s.getSceneGroup()); " then the wrong appear: (please help me)

javax.media.j3d.CapabilityNotSetException: Group: no capability to remove children() at javax.media.j3d.Group.removeChild(Group.java:349)() at ObjLoad.change(ObjLoad.java:257)() at ObjLoad.actionPerformed(ObjLoad.java:249)() at java.awt.Button.processActionEvent(Button.java:381)() at java.awt.Button.processEvent(Button.java:350)() at java.awt.Component.dispatchEventImpl(Component.java:3639)() at java.awt.Component.dispatchEvent(Component.java:3480)() at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)() at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)() at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)() at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)() at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)() at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)()

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